Shared information bias is the tendency of groups to spend time and energy discussing information that most group members already know. Consequently they have less time and energy to devote to information that only a few members know. [Stasser & Titus 1985] [Van Swol 2007] [Forsyth 2010] This bias in the way the group invests its resources leads to misalignment between reality and the group's perceptions, and eventually to bad decisions.
For example, in discussing possible solutions to a technical problem, the portion of the discussion devoted to information that most group members already know will tend to be disproportionately large, in terms of importance, compared to the portion of the discussion regarding technical subtleties known only to the few group members with relevant expertise. In part, this happens because the number of people who are familiar with the commonly shared information is greater than the number of people who are familiar with the less commonly shared information. But research suggests that the shared information bias is greater than mere numbers would predict.
Although bad decisions are the most commonly cited effect of shared information bias, the damage it causes transcends the substance of the immediate decision at hand. That's why it's important to consider other effects of the bias, to motivate groups to address shared information bias with the attention it deserves.
Here, in Part I of this exploration, are four ways shared information bias harms group processes.
- Members experience a false sense of comfort and well being
- Repeated Shared information bias leads to
misalignment between reality and
the group's perceptions, and
eventually to bad decisionsexperiences of discussions that fail to challenge group members' beliefs and preconceptions can enhance their sense of comfort and well being, however false it might be. This misapprehension of the group's actual state can expose it to great risk of chaos if it encounters a situation to which it has been rendered vulnerable by this false sense of security. - Enhanced likelihood of groupthink
- Groupthink is a group-psychological dynamic that causes the group to converge on an outcome not on the basis of the tenets to which the group claims it subscribes, but instead as a means of achieving group harmony and conformity. The probability of an irrational and dysfunctional outcome is thus elevated. When groupthink is in effect, the group tries to minimize conflict and reach consensus, even at the cost of abandoning critical thinking, suppressing alternative viewpoints, and preventing access to external influence. Shared information bias thus facilitates groupthink by providing a false sense of comfort and well being and a variety of contributions that are consistent with the views and preconceptions of group members. For more about groupthink, see "Design Errors and Groupthink," Point Lookout for April 16, 2014.
- Biased assessments of importance
- In groups, especially in real or virtual meetings, a commonly used heuristic for assessing the importance of an idea or insight is group members' sense of the number of times it arises in discussion. People don't actually count occurrences; a subjective sense seems to be sufficient. If the group is experiencing a shared information bias, that bias skews the subjective sense of the frequency of mentions of ideas. The group members then tend to assess the importance of frequently cited ideas as greater than they might actually be. And that can skew the discussion away from directions that might reveal insights and perspective far more important than anything discussed so far.
- Increased persistence of wrong beliefs
- If someone withholds an incorrect opinion, misinformation, or misapprehension, that they themselves have accepted, it's less likely to be refuted by another group member who knows that the withheld contribution is incorrect, misinformed, or confused, but who doesn't know that any group members subscribe to it. And the longer the confusion remains in the mind of the holder, the longer it's available in that person's mind to discredit truthful beliefs and accurate perceptions.
We'll continue next time with five more ways in which shared information bias inflicts harm on group processes. Next issue in this series Top Next Issue
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Related articles
More articles on Cognitive Biases at Work:
- The Planning Fallacy and Self-Interest
- A well-known cognitive bias, the planning fallacy, accounts for many unrealistic estimates of project
cost and schedule. Overruns are common. But another cognitive bias, and organizational politics, combine
with the planning fallacy to make a bad situation even worse.
- Seven Planning Pitfalls: III
- We usually attribute departures from plan to poor execution, or to "poor planning." But one
cause of plan ineffectiveness is the way we think when we set about devising plans. Three cognitive
biases that can play roles are the so-called Magical Number 7, the Ambiguity Effect, and the Planning Fallacy.
- Seven More Planning Pitfalls: III
- Planning teams, like all teams, are vulnerable to several patterns of interaction that can lead to counter-productive
results. Two of these relevant to planners are a cognitive bias called the IKEA Effect, and a systemic
bias against realistic estimates of cost and schedule.
- Risk Acceptance: Naïve Realism
- When we suddenly notice a "project-killer" risk that hasn't yet materialized, we sometimes
accept the risk even though we know how seriously it threatens the effort. A psychological phenomenon
known as naïve realism plays a role in this behavior.
- The Risk of Astonishing Success
- When we experience success, we're more likely to develop overconfidence. And when the success is so
extreme as to induce astonishment, we become even more vulnerable to overconfidence. It's a real risk
of success that must be managed.
See also Cognitive Biases at Work and Cognitive Biases at Work for more related articles.
Forthcoming issues of Point Lookout
- Coming January 29: A Framework for Safe Storming
- The Storming stage of Tuckman's development sequence for small groups is when the group explores its frustrations and degrees of disagreement about both structure and task. Only by understanding these misalignments is reaching alignment possible. Here is a framework for this exploration. Available here and by RSS on January 29.
- And on February 5: On Shaking Things Up
- Newcomers to work groups have three tasks: to meet and get to know incumbent group members; to gain their trust; and to learn about the group's task and how to contribute to accomplishing it. General skills are necessary, but specifics are most important. Available here and by RSS on February 5.
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